SIDEWINDER BARRIER®, a high visibility safety yellow retractable barrier is effective as a machine barrier, customized as required. The pull handle can be fitted for an interlock. Laboratory weed eater thrash testing left no vinyl panel damage. A safety yellow steel housing and solid vinyl curtain, 4′ x 12′, allows one person to easily extend or retract the spring-loaded SIDEWINDER BARRIER. Simple installation requires four anchor bolts to secure the panel housing and 4 anchor bolts to secure the Receiving Post. There are six receiving hook styles to choose from, including a removable center post which allows the use of two barriers to close off up to 24′. For lighter duty applications, DOCK-ALERT®, designed for loading docks, is available with a steel reinforced PVC housing and air-thru mesh curtain. SIDEWINDER BARRIER, for inside or outside, is currently in use in combination with a safety laser beam to protect a high voltage test area, to keep employees away from a conveyor when running, can alert employees to an autoclave pit hazard, to partition a test area with different configuration, to allow limited access to a trolley barn when overhead doors are open, to divert plant traffic and to close off a road adjacent to a helipad when helicopter is landing or taking off.